CVE-2025-54770
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
A Use-after-Free vulnerability has been found in the GRUB2 bootloader's network module. The flaw is caused by improper unregistration of the net_set_vlan command when the module is unloaded from memory. An attacker can exploit this to cause system instability and a complete crash.
Risk Assessment
The risk is a Denial of Service (DoS) attack that can halt the system during boot, leading to service unavailability. Recovery may require physical access to the machine.
Recommendation
Apply the vendor-supplied patch for GRUB2 immediately or disable the network module in the bootloader configuration if not needed. Monitor Linux distribution security advisories for an updated package.
Original NVD description (English source)
A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability